hypoplastron


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hypoplastron

[¦hī·pō¦plas·trən]
(vertebrate zoology)
Either of the third pair of lateral bony plates in the plastron of most turtles.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
ROM-42102 is a fragment of the right hypoplastron. On its ventral surface, this specimen exhibits a well-preserved abdominal-femoral sulcus (Fig.
(A-B) ROM-41848 left epiplastron in ventral view; (C-D) ROM-42183 entoplastron in ventral view; (E-F) ROM-42070 right epiplastron in ventral view; (G-H) ROM-42114 right hyoplastron in ventral view; (I-J) ROM-42102 right hypoplastron in ventral view; (K-L) ROM-42053 right xiphiplastron in ventral view; (M-N) ROM 42056 left xiphiplastron in ventral view; (O) plastron of extant Rhinoclemmys melanosterna CRI-4898 in ventral view.
-- The hypoplastron of Emydoidea blandingii is easily distinguished from those of other North American emydid turtles of similar size on the basis of the following characteristics: 1) abdominal-pectoral sulcus joins hyo-hypoplastral suture at midline; 2) humeral-pectoral sulcus placed far anteriorly; 3) angular epi-hypoplastral suture; 4) bridge buttress limited in its anterior extent; and 5) posterior edge of bone lateral to bridge buttress bevelled for hypoplastral hinge attachment.